I believe I might be psychic. When I was a kid I could see ghosts, but I got so afraid I could not communicate with them. I feel like I have blocked this ability out because I got so scared.
I often dream of future events in my life that eventually happen, sometimes years before they do happen and I often experience the feeling of deja vu - and when I do I know what happens next.

I also get a very vague feeling of for example, whether something has happened or not, whether I passed or failed an interview, whether this or that team won the match.

I have actually doubted myself a lot and call myself silly for believing this (my family is very logical and sciency), that there is no such thing as being psychic, but in the back of my mind I honestly do believe I might be psychic. This is the first time I'm actually sharing this piece of myself, I have tried sharing it with people I love but they just laugh at me and call me silly.

ANYWAY. My question is... could I be psychic? If I am, how do I strengthen this ability?

I'm a bit psychic. I often dream visions, the small ones.
You are psychic, no doubt, IF what you said is true. Being psychic isn't impossible. It's a gift from God which sometimes works as a curse when you see things in dreams you don't want to.
You can strengthen this ability by meditating daily. Meditate for 5 minutes the first day. Meditate for 7 minutes the next day and go on like that. It will not only strengthen your ability, but also help you get rid of anxiety and calm you down. Also, I personally recommend believing the fact that you ARE psychic. When you start to doubt if you are psychic, you start losing the ability. You can try to sharpen your psychic ability by forcing your brain (not too hard) to guess what might happen in the future. For example, who might win in the next football match? When the doorbell rings, who can it be?
I'll be glad to know if this advice helped you in any way. Hope you succeed in sharpening your psychic ability. Good luck!

You are a psychic, and since you used to see ghosts you were a medium as well. So essentially a "psychic medium". These sensations though, they are psychic abilities and intuition. Just like mentioned, everyone is a psychic. And just as mentioned, you need to have self-confidence.

I was asking a few people to give me photos, to do readings on them. I do not do readings well, but it seems I get their emotions from ther pic highly. In the beginning I didn't believe I could do it, I didn't believe I was for this yet. But as I realised some were correct, my confidence started to rise up. Lately, a few days ago I asked someone to send a pic. I got her emtoions perfectly, with no single mistake, cause I had self-confidence. Self-confidence is a key, do not forget that...